Greenlee 4-1/2" Bi-Metal Varia...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$128.04
$78.04
Greenlee 4-1/2" Bi-Metal Variable Pitch Hole Saw with 1-5/8" Cutting Depth

Greenlee 4-1/2" Bi-Metal Variable Pitch Hole Saw with 1-5/8" Cutting Depth

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Model: 825-4-1/2
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$128.04
$78.04
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Greenlee 4-1/2" Bi-Metal Variable Pitch Hole Saw with 1-5/8" Cutting Depth

Professional Bi-Metal Construction for Versatile Material Cutting

The Greenlee 4-1/2" Bi-Metal Variable Pitch Hole Saw delivers professional-grade cutting performance with its extra-tough bi-metal blade construction and 1-5/8" cutting depth capability. Engineered for reliable operation across multiple materials including steel, tin, aluminum, fiberglass, wood, and plastic, this hole saw features an extra-thick backplate design that minimizes vibration for smoother cutting operations and enhanced precision in professional applications.

Professional Features & Benefits

  • 4-1/2" Cutting Diameter: Provides precise hole sizing for electrical, plumbing, and HVAC installations with consistent results.
  • Bi-Metal Blade Construction: Extra-tough design made from highest grade tool steel ensures durability and extended service life across demanding applications.
  • 1-5/8" Cutting Depth: Deep cut capability allows cutting through 2x4 wood studs and thick materials in single pass operations.
  • Extra-Thick Backplate Design: Minimizes vibration during cutting for smoother operation and improved cut quality with reduced operator fatigue.
  • Steam Oxide Finish: Provides cooler running performance and enhanced blade longevity during extended cutting operations.
  • Multi-Material Compatibility: Cuts through steel, tin, aluminum, fiberglass, wood, and plastic for versatile professional applications.
  • 7/16" Arbor Shank: Standard shank size ensures compatibility with most professional drill systems and arbor assemblies.

Technical Specifications

  • Arbor Size: 7/16 In shank size.
  • Country Of Origin: United States
  • Cutting Size: 4-1/2 In
  • Product Type: Bi-Metal Hole Saw

Installation & Operation

  1. Mount the hole saw securely on compatible arbor assembly with 7/16" shank compatibility and appropriate pilot bit.
  2. Mark the cutting location accurately and ensure workpiece is properly secured to prevent movement during cutting.
  3. Begin cutting at moderate speed with steady pressure, allowing the variable pitch teeth to establish the cut.
  4. Maintain consistent feed rate and allow the steam oxide finish to provide cooling during extended cutting operations.
  5. Clear debris periodically during deep cuts to maintain cutting efficiency and prevent binding.
  6. Complete the cut and remove the hole saw carefully, checking for proper hole diameter and smooth finish quality.

Professional Applications

  • Electrical installations requiring precise conduit and cable entry holes
  • Plumbing applications for pipe routing through structural members
  • HVAC ductwork and ventilation system installations
  • General construction and remodeling projects
  • Industrial maintenance and repair operations
  • Multi-material fabrication and assembly work
  • Professional contractor and tradesman applications

Why Choose Greenlee Quality?

Greenlee delivers professional-grade cutting tools with proven reliability and durability. This bi-metal hole saw features highest grade tool steel construction and USA manufacturing quality, ensuring consistent performance and extended service life in demanding professional applications. The extra-thick backplate design and steam oxide finish demonstrate Greenlee's commitment to professional tool innovation and operator satisfaction.

Manufacturer Resources

Spec Sheet

Product Specs

Arbor Size:
7/16 In shank size.
Country Of Origin:
United States
Cutting Size:
4-1/2 In
Product Type:
Hole Saw
Department:
Electrical
Product Subgroup:
Hole Saws & Bits
Product Group:
Power Tools & Accessories

Greenlee 825-4-1/2 – Frequently Asked Questions

1) Will a Greenlee 825-4-1/2 hole saw fit my existing hole saw arbor?
The 825-4-1/2 uses a 7/16 inch shank size, which is the common size for larger-diameter bi-metal hole saws and standard large arbor assemblies. If your arbor takes a 7/16 inch hex shank with a pilot drill, this mounts straight on. Smaller saws that run on a 3/8 inch shank arbor will not accept it.
2) Does the Greenlee 825-4-1/2 come with an arbor and pilot bit?
No. The 825-4-1/2 is the saw cup only, ordered as model 825-4-1/2. You supply an arbor assembly with a 7/16 inch shank and the pilot drill. If you are building a kit from scratch, order the arbor separately.
3) What materials will a 4-1/2 inch bi-metal hole saw cut besides wood?
Steel, tin, aluminum, fiberglass, wood and plastic. The bi-metal blade is made from high grade tool steel, so sheet metal panels, enclosures and conduit knockout work are within range as well as framing lumber and plastic.
4) What size hole does the Greenlee 825-4-1/2 actually cut, and will it pass 4 inch conduit?
Cutting size is 4-1/2 inches in diameter. That is the hole, not the saw body. It is the size typically used to pass 4 inch trade size conduit or pipe, whose outside diameter runs larger than the nominal 4 inches, so the 4-1/2 inch opening gives clearance.
5) What part number do I order for the 4-1/2 inch Greenlee bi-metal hole saw?
Greenlee 825-4-1/2. The 825 prefix is the bi-metal variable pitch hole saw series and the suffix is the cutting diameter, so the number reads directly as the 4-1/2 inch cup.
6) Should I use a bi-metal hole saw or a carbide cutter for cutting a 4-1/2 inch hole?
A bi-metal cup like the Greenlee 825-4-1/2 is the general purpose choice: it handles steel, aluminum, tin, fiberglass, wood and plastic, and at 1-5/8 inches of depth it clears framing and panel thicknesses. Where it is the wrong tool is masonry, tile, cast iron and stainless at production rates, those call for carbide or diamond. For mixed electrical, plumbing and HVAC rough-in through studs and sheet metal, bi-metal is what you want in the pouch.
7) Why does a variable pitch hole saw cut better in sheet metal than a standard tooth saw?
Variable pitch tooth spacing breaks up the harmonic that makes a uniform-pitch saw chatter and skate on thin steel or tin. On the Greenlee 825 the effect is backed up by an extra-thick backplate that holds the cup rigid and keeps vibration down, which is what gives you a round hole in a panel rather than a chewed one.
8) Where is the Greenlee 825 hole saw made? I have a domestic sourcing requirement.
United States. For government, institutional, or federally funded work with domestic content requirements, the 825-4-1/2 is US manufactured.
9) Is the steam oxide finish on this hole saw worth anything in practice?
It runs cooler. The steam oxide coating on the Greenlee 825 series cup helps shed heat during long or deep cuts, which is where bi-metal teeth normally lose their edge. It does not replace cutting fluid in steel, but on repeated cuts the blade holds up longer.
How fast can I get the Greenlee 825-4-1/2 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Greenlee 825-4-1/2 come with a warranty?
Absolutely. The Greenlee 825-4-1/2 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Greenlee 825-4-1/2?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Greenlee 825-4-1/2 from ZenSupply?
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